check_include_file(sys/types.h HAVE_SYS_TYPES_H)
check_include_file(stdint.h    HAVE_STDINT_H)
check_include_file(stddef.h    HAVE_STDDEF_H)

#
# Check to see if we have large file support
#
set(CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
# We add these other definitions here because CheckTypeSize.cmake
# in CMake 2.4.x does not automatically do so and we want
# compatibility with CMake 2.4.x.
if(HAVE_SYS_TYPES_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_TYPES_H)
endif()
if(HAVE_STDINT_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDINT_H)
endif()
if(HAVE_STDDEF_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDDEF_H)
endif()

check_type_size(off64_t OFF64_T)
if(HAVE_OFF64_T)
   add_definitions(-D_LARGEFILE64_SOURCE=1)
endif()
set(CMAKE_REQUIRED_DEFINITIONS) # clear variable

#
# Check for fseeko
#
check_function_exists(fseeko HAVE_FSEEKO)
if(NOT HAVE_FSEEKO)
    add_definitions(-DNO_FSEEKO)
endif()

#
# Check for unistd.h
#
check_include_file(unistd.h Z_HAVE_UNISTD_H)

if(MSVC)
    set(CMAKE_DEBUG_POSTFIX "d")
    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
    add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
endif()

if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    # If we're doing an out of source build and the user has a zconf.h
    # in their source tree...
    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h)
        message(FATAL_ERROR
            "You must remove ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h "
            "from the source tree.  This file is included with zlib "
            "but CMake generates this file for you automatically "
            "in the build directory.")
  endif()
endif()

#configure_file(${CMAKE_CURRENT_SOURCE_DIR}/zconf.in.h ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h @ONLY)
include_directories(${CMAKE_CURRENT_SOURCE_DIR})


#============================================================================
# zlib
#============================================================================

set(ZLIB_PUBLIC_HDRS
    ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h
    zlib.h
)
set(ZLIB_PRIVATE_HDRS
crc32.h  deflate.h  inffast.h  inffixed.h  inflate.h  inftrees.h  trees.h  zconf.h  zlib.h  zutil.h

)
set(ZLIB_SRCS
  adler32.c  compress.c  crc32.c  deflate.c  inffast.c  inflate.c  inftrees.c  trees.c  zutil.c
)

# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([0-9A-Za-z.]+)\".*"
    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})

add_library(zlib STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL COMPILE_FLAGS "${EXTRA_COMPILE_FLAGS}")

set_target_properties(zlib PROPERTIES SOVERSION 1)

if(NOT CYGWIN)
    # This property causes shared libraries on Linux to have the full version
    # encoded into their final filename.  We disable this on Cygwin because
    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
    # seems to be the default.
    #
    # This has no effect with MSVC, on that platform the version info for
    # the DLL comes from the resource file win32/zlib1.rc
    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
endif()

if(UNIX)
    # On unix-like platforms the library is almost always called libz
   set_target_properties(zlib PROPERTIES OUTPUT_NAME z)
elseif(BUILD_SHARED_LIBS AND WIN32)
    # Creates zlib1.dll when building shared library version
    set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
endif()

#if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
#    install(TARGETS zlib
#        RUNTIME DESTINATION bin
#        ARCHIVE DESTINATION lib
#        LIBRARY DESTINATION lib )
#endif()
#if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
#    install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION include)
#endif()
#if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
#    install(FILES zlib.3 DESTINATION share/man/man3)
#endif()

#============================================================================
# Example binaries
#============================================================================

#add_executable(example example.c)
#target_link_libraries(example zlib)
#add_test(example example)
#
#add_executable(minigzip minigzip.c)
#target_link_libraries(minigzip zlib)
#
#if(HAVE_OFF64_T)
#    add_executable(example64 example.c)
#    target_link_libraries(example64 zlib)
#    set_target_properties(example64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
#    add_test(example64 example64)
#
#    add_executable(minigzip64 minigzip.c)
#    target_link_libraries(minigzip64 zlib)
#    set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
#endif()
